Without seeing the coin it's not possible to say why it would appear to be copper. It could have been dipped in acid, plated with copper as a school chemistry experiment, or be what's called a "lamination error" in which the outer copper-nickel layers of a normal dime separated from the copper core.
Your best bet would be to have it examined in person by a dealer or appraiser who could test its weight and look at it under a magnifier.
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